Colloidal stability of nanoparticles stabilized with mixed ligands in solvents with varying polarity

2020 ◽  
Vol 56 (58) ◽  
pp. 8131-8134
Author(s):  
Hu Zhu ◽  
Elisabeth Prince ◽  
Pournima Narayanan ◽  
Kun Liu ◽  
Zhihong Nie ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Stability ◽  
Solvent Polarity ◽  
Cetyl Trimethylammonium Bromide ◽  
Mixed Ligands ◽  
Polymer Ligands

For gold nanoparticles stabilized with cetyl trimethylammonium bromide (CTAB) and polymer ligands, increase in solvent polarity leads to stabilization–aggregation–stabilization–aggregation transitions.

Seed-mediated synthesis and PEG coating of gold nanoparticles for controlling morphology and sizes

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3353-3360
Author(s):  
Susana Helena Arellano Ramírez ◽  
Perla García Casillas ◽  
Christian Chapa González
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Infrared Spectrometry ◽  
Ammonium Bromide ◽  
Chloroauric Acid ◽  
Vis Spectroscopy ◽  
Seed Mediated ◽  
Peg Coating

AbstractA significant area of research is biomedical applications of nanoparticles which involves efforts to control the physicochemical properties through simple and scalable processes. Gold nanoparticles have received considerable attention due to their unique properties that they exhibit based on their morphology. Gold nanospheres (AuNSs) and nanorods (AuNRs) were prepared with a seed-mediated method followed of polyethylene glycol (PEG)-coating. The seeds were prepared with 0.1 M cetyltrimethyl-ammonium bromide (CTAB), 0.005 M chloroauric acid (HAuCl4), and 0.01 M sodium borohydride (NaBH4) solution. Gold nanoparticles with spherical morphology was achieved by growth by aggregation at room temperature, while to achieve the rod morphology 0.1 M silver nitrate (AgNO3) and 0.1 M ascorbic acid solution were added. The gold nanoparticles obtained by the seed-mediated synthesis have spherical or rod shapes, depending on the experimental conditions, and a uniform particle size. Surface functionalization was developed using polyethylene glycol. Morphology, and size distribution of AuNPs were evaluated by Field Emission Scanning Electron Microscopy. The average size of AuNSs, and AuNRs was 7.85nm and 7.96 x 31.47nm respectively. Fourier transform infrared spectrometry was performed to corroborate the presence of PEG in the AuNPs surface. Additionally, suspensions of AuNSs and AuNRs were evaluated by UV-Vis spectroscopy. Gold nanoparticles were stored for several days at room temperature and it was observed that the colloidal stability increased once gold nanoparticles were coated with PEG due to the shield formed in the surface of the NPs and the increase in size which were 9.65±1.90 nm of diameter for AuNSs and for AuNRs were 29.03±5.88 and 8.39±1.02 nm for length and transverse axis, respectively.

A highly efficient ligand exchange reaction on gold nanoparticles: preserving their size, shape and colloidal stability

RSC Advances ◽  
2014 ◽  
Vol 4 (64) ◽  
pp. 34217-34220 ◽  
Author(s):  
Melissa R. Dewi ◽  
Geoffry Laufersky ◽  
Thomas Nann
Keyword(s):  
Gold Nanoparticles ◽  
Solvent Extraction ◽  
Exchange Reaction ◽  
Ligand Exchange ◽  
Colloidal Stability ◽  
Ligand Exchange Reaction ◽  
Highly Efficient

Almost complete ligand exchange and excellent colloidal stability of gold nanoparticles can be achieved by a new solvent extraction based method.

scholarly journals High colloidal stability ZnO nanoparticles independent on solvent polarity and their application in polymer solar cells

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Woojin Lee ◽  
Jiwoo Yeop ◽  
Jungwoo Heo ◽  
Yung Jin Yoon ◽  
Song Yi Park ◽  
...  
Keyword(s):  
Solar Cells ◽  
Zno Nanoparticles ◽  
Colloidal Stability ◽  
Polymer Solar Cells ◽  
Atmospheric Condition ◽  
Solvent Polarity ◽  
Zno Nps ◽  
Long Term Stability ◽  
Nonpolar Solvents ◽  
Efficient Route

Abstract Significant aggregation between ZnO nanoparticles (ZnO NPs) dispersed in polar and nonpolar solvents hinders the formation of high quality thin film for the device application and impedes their excellent electron transporting ability. Herein a bifunctional coordination complex, titanium diisopropoxide bis(acetylacetonate) (Ti(acac)2) is employed as efficient stabilizer to improve colloidal stability of ZnO NPs. Acetylacetonate functionalized ZnO exhibited long-term stability and maintained its superior optical and electrical properties for months aging under ambient atmospheric condition. The functionalized ZnO NPs were then incorporated into polymer solar cells with conventional structure as n-type buffer layer. The devices exhibited nearly identical power conversion efficiency regardless of the use of fresh and old (2 months aged) NPs. Our approach provides a simple and efficient route to boost colloidal stability of ZnO NPs in both polar and nonpolar solvents, which could enable structure-independent intense studies for efficient organic and hybrid optoelectronic devices.

Triggered drug release from hybrid thermoresponsive nanoparticles using near infrared light

Nanomedicine ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 219-234 ◽  
Author(s):  
Isabel Ortiz de Solorzano ◽  
Martin Prieto ◽  
Gracia Mendoza ◽  
Victor Sebastian ◽  
Manuel Arruebo
Keyword(s):  
Drug Delivery ◽  
Gold Nanoparticles ◽  
Colloidal Stability ◽  
Near Infrared ◽  
Chemical Characterization ◽  
Infrared Light ◽  
Galvanic Replacement ◽  
Heating Efficiency ◽  
Hollow Gold Nanoparticles

Aim: Developing hybrid poly(N-isopropylacrylamide)-based nanogels decorated with plasmonic hollow gold nanoparticles for on-demand drug delivery and their physico-chemical characterization, bupivacaine loading and release ability upon light irradiation, and in vitro cell viability. Materials & methods: Hollow gold nanoparticles were prepared by galvanic replacement reaction; poly(N-isopropylacrylamide)-based nanogels were synthesized via precipitation polymerization and their electrostatic coupling was accomplished using poly(allylamine hydrochloride) as cationic polyelectrolyte linker. Results & conclusion: Colloidal stability of the resulted hybrid nanovectors was demonstrated under physiological conditions together with their fast response and excellent heating efficiency after light stimulation, indicating their potential use as triggered drug-delivery vectors. Moreover, their influence on cell metabolism and cell cycle under subcytotoxic doses were studied showing excellent cytocompatibility.

scholarly journals Synthesis and anticancer properties of fucoidan-mimetic glycopolymer coated gold nanoparticles

2015 ◽  
Vol 51 (40) ◽  
pp. 8532-8535 ◽  
Author(s):  
Mattias Tengdelius ◽  
Deepanjali Gurav ◽  
Peter Konradsson ◽  
Peter Påhlsson ◽  
May Griffith ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Stability ◽  
Anticancer Properties ◽  
Anti Cancer

Gold nanoparticles coated with fucoidan-mimetic glycopolymers were synthesized that displayed good colloidal stability and promising anti-cancer properties.

scholarly journals Biointeractions of ultrasmall glutathione-coated gold nanoparticles: effect of small size variations

Nanoscale ◽  
2016 ◽  
Vol 8 (12) ◽  
pp. 6577-6588 ◽  
Author(s):  
Alioscka A. Sousa ◽  
Sergio A. Hassan ◽  
Luiza L. Knittel ◽  
Andrea Balbo ◽  
Maria A. Aronova ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colloidal Stability

Small size differences can affect the colloidal stability of ultrasmall AuNPs, underscoring the importance of particle uniformity in nanomedicine.

Hybrid Microgels Containing Gold Nanoparticles

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Andrij Pich ◽  
Arpita Karak ◽  
Yan Lu ◽  
Anup K. Ghosh ◽  
Hans-Juergen P. Adler
Keyword(s):  
Gold Nanoparticles ◽  
Sodium Citrate ◽  
Colloidal Stability ◽  
Nano Particles ◽  
Composite Particles ◽  
Temperature Sensitive ◽  
Chloroauric Acid ◽  
Gold Nano Particles ◽  
Hybrid Microgels

AbstractIn present paper we report on a preparation of hybrid microgels filled with gold nano-particles (AuNPs). Temperature-sensitive VCL/AAEM microgels have been used as containers for deposition of Au by in situ formation of gold nano-particles. Synthesis of AuNPs has been performed by two methods: a) reduction of chloroauric acid with sodium borhydride and b) reduction of chloroauric acid by sodium citrate under ultrasonic agitation. In both cases AuNPs were deposited directly into microgels leading to formation of composite particles which exhibit temperature-sensitive properties, tunable gold contents and high colloidal stability. The influence of Au load on microgel size, morphology, swellingdeswelling behaviour and stability is discussed.

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